History of start 3 changes

In crates/backdrop/src/lib.rs, lines 266–384 on 8bb7baeb4557754a8602cf6a0b0ef3e4335ff5a0703e417a53c2e61aaf825036. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 266,384:crates/backdrop/src/lib.rs.